US8292605B2ActiveUtilityA1
Rotary fluid device with multi-level phase shift control
Est. expirySep 30, 2028(~2.2 yrs left)· nominal 20-yr term from priority
F04C 14/10F04C 2270/80F04C 2270/86F04C 14/24F04C 14/065
77
PatentIndex Score
5
Cited by
12
References
20
Claims
Abstract
A method for controlling a rotary fluid device includes providing a rotary fluid device having a fluid displacement assembly and a plurality of control valves. The fluid displacement assembly includes a first member and a second member. The first and second members have relative movement and define a plurality of volume chambers. The plurality of control valves is in fluid communication with the plurality of volume chambers. A desired displacement is received. A relative position of the first and second members is determined. An optimal displacement family is selected from a plurality of displacement families that is based on peak displacements of a plurality of displacement curves. A phase shift angle for the optimal displacement family is selected so that an actual displacement of the fluid displacement assembly approaches the desired displacement. The control valves of the rotary fluid device are actuated in accordance with the phase shift angle.
Claims
exact text as granted — not AI-modified1. A method for controlling a rotary fluid device comprising:
providing a rotary fluid device including:
a fluid displacement assembly including a first member and a second member, the first and second members having relative movement and cooperatively defining a plurality of volume chambers;
a plurality of control valves in fluid communication with the volume chambers;
receiving a desired displacement;
determining a relative position of the second member to the first member of the fluid displacement assembly;
selecting an optimal displacement family from a plurality of displacement families that is based on peak displacements of a plurality of displacement curves;
selecting a phase shift angle for the optimal displacement family so that an actual displacement of the fluid displacement assembly approaches the desired displacement; and
actuating the control valves of the rotary fluid device in accordance with the phase shift angle.
2. The method of claim 1 , wherein the fluid displacement assembly is a gerotor.
3. The method of claim 1 , wherein the first member is a ring member having a plurality of rollers and the second member is a star member.
4. The method of claim 3 , wherein the star member orbits and rotates relative to the ring member.
5. The method of claim 1 , wherein an encoder is used to determine the relative position of the second member to the first member of the fluid displacement assembly.
6. The method of claim 1 , further comprising selecting an optimal valve configuration based on the phase shift angle.
7. A method for controlling an electro-hydraulic system comprising:
providing an electro-hydraulic system including:
a rotary fluid device including:
a fluid displacement assembly including a first member and a second member, the first and second members having relative movement and defining a plurality of volume chambers;
a plurality of control valves in fluid communication with the volume chambers;
an electronic control unit in electrical communication with the plurality of control valves;
receiving a desired displacement;
determining a relative position of the second member to the first member of the fluid displacement assembly;
selecting an optimal displacement family from a plurality of displacement families that is based on peak displacements of a plurality of displacement curves;
selecting a phase shift angle of the optimal displacement family so that an actual displacement of the fluid displacement assembly approaches the desired displacement;
selecting an optimal valve configuration based on the phase shift angle; and
actuating the control valves of the rotary fluid device in accordance with the optimal valve configuration.
8. The method of claim 7 , wherein the fluid displacement assembly is a gerotor.
9. The method of claim 7 , wherein the first member is a ring member having a plurality of rollers and the second member is a star member.
10. The method of claim 9 , wherein the star member orbits and rotates relative to the ring member.
11. The method of claim 7 , wherein the peak displacement of the optimal displacement family F(k) is greater than the desired displacement, which is greater than the peak displacement of an immediately preceding displacement family F(k−1).
12. The method of claim 7 , wherein the phase shift angle is selected by locating an optimal zero displacement angle in the optimal displacement family.
13. The method of claim 12 , wherein the optimal zero displacement angle is equal to
β
+
sin
-
1
(
D
d
D
p
(
F
(
k
)
)
)
,
where β is the orbit angle of the second member relative to the first member, D d is the desired displacement, and D p (F(k)) is the peak displacement for displacement family F(k).
14. A method for controlling a rotary fluid device comprising:
providing a rotary fluid device including:
a fluid displacement assembly including a ring member and a star member, the ring and star members having relative movement and defining a plurality of volume chambers;
a plurality of control valves in fluid communication with the volume chambers;
receiving a desired displacement;
determining a relative position of the star member to the ring member of the fluid displacement assembly;
selecting an optimal displacement family from a plurality of displacement families that is based on peak displacements of a plurality of displacement curves, the peak displacement of the optimal displacement family being greater than the desired displacement, which is greater than the peak displacement of an immediately preceding displacement family;
locating an optimal zero displacement angle in the optimal displacement family;
selecting an optimal valve configuration based on the optimal zero displacement angle; and
actuating the control valves of the rotary fluid device in accordance with the optimal valve configuration.
15. The method of claim 14 , wherein the star member orbits and rotates relative to the ring member.
16. The method of claim 14 , wherein the optimal zero displacement angle is equal to
β
+
sin
-
1
(
D
d
D
p
(
F
(
k
)
)
)
,
where β is an orbit angle of the star member relative to the ring member, D d is the desired displacement, and D p (F(k)) is the peak displacement for displacement family F(k).
17. The method of claim 14 , wherein each of the control valves is a two-position, three-way valve.
18. The method of claim 14 , wherein the ring member includes a plurality of rollers.
19. The method of claim 14 , wherein an encoder is used in the determination of relative position of the star member to the ring member of the fluid displacement assembly.
20. The method of claim 14 , wherein the rotary fluid device is a motor.Cited by (0)
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